2.4. DLLME optimization
The type of dispersive solvent (acetone, acetonitrile, methanol and
ethanol) and extraction solvent (1,2-dichlorobenzene, carbon tetrachloride
and monochlorobenzene) was evaluated. After the choice of
extraction and dispersive solvents, the respective volumes were also
evaluated from 20 to 140 μL and from 300 to 1100 μL. Other important
parameters were also investigated such as pH (2 to 5), concentration
of chelating agent (0 to 2%), effect salt addition (0 to 10%), number of
washing steps (0 to 4) and centrifugation time (1 to 15 min).
2.4. DLLME optimization
The type of dispersive solvent (acetone, acetonitrile, methanol and
ethanol) and extraction solvent (1,2-dichlorobenzene, carbon tetrachloride
and monochlorobenzene) was evaluated. After the choice of
extraction and dispersive solvents, the respective volumes were also
evaluated from 20 to 140 μL and from 300 to 1100 μL. Other important
parameters were also investigated such as pH (2 to 5), concentration
of chelating agent (0 to 2%), effect salt addition (0 to 10%), number of
washing steps (0 to 4) and centrifugation time (1 to 15 min).
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